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6890673: Eliminate allocations immediately after EA

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Try to eliminate allocations and related locks immediately after escape analysis.

Reviewed-by: never
This commit is contained in:
Vladimir Kozlov 2011-11-16 09:13:57 -08:00
parent 81c085a1e2
commit 8d2ee23293
11 changed files with 148 additions and 71 deletions
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10
hotspot/src/share/vm/opto/memnode.cpp
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@ -2661,6 +2661,8 @@ uint StrIntrinsicNode::match_edge(uint idx) const {
// control copies
Node *StrIntrinsicNode::Ideal(PhaseGVN *phase, bool can_reshape) {
if (remove_dead_region(phase, can_reshape)) return this;
// Don't bother trying to transform a dead node
if (in(0) && in(0)->is_top()) return NULL;
if (can_reshape) {
Node* mem = phase->transform(in(MemNode::Memory));
@ -2675,6 +2677,12 @@ Node *StrIntrinsicNode::Ideal(PhaseGVN *phase, bool can_reshape) {
return NULL;
}
//------------------------------Value------------------------------------------
const Type *StrIntrinsicNode::Value( PhaseTransform *phase ) const {
if (in(0) && phase->type(in(0)) == Type::TOP) return Type::TOP;
return bottom_type();
}
//=============================================================================
MemBarNode::MemBarNode(Compile* C, int alias_idx, Node* precedent)
: MultiNode(TypeFunc::Parms + (precedent == NULL? 0: 1)),
@ -2715,6 +2723,8 @@ MemBarNode* MemBarNode::make(Compile* C, int opcode, int atp, Node* pn) {
// control copies
Node *MemBarNode::Ideal(PhaseGVN *phase, bool can_reshape) {
if (remove_dead_region(phase, can_reshape)) return this;
// Don't bother trying to transform a dead node
if (in(0) && in(0)->is_top()) return NULL;
// Eliminate volatile MemBars for scalar replaced objects.
if (can_reshape && req() == (Precedent+1) &&